Similar to the effects of Dark Weapon, casting Resonant Weapon grants an extra 50 Dark damage to the enchanted weapon. However, like Resonant Flesh, the Dark Bonus boost and duration depend on the amount of souls held at the time of casting. Should the player possess little to no souls when casting the spell, then they will only gain a 10% boost, and the effect will only last for 10 seconds; alternatively, when cast with 2,000 souls, the player gains a boost of 50%, and the spell will last for 60 seconds. Upon casting the hex, 2,000 souls will be consumed. If less than 2,000 souls are in the player's possession, they will all be consumed.